A husband and wife, Nobuo and Ayumi, are living frugally in an apartment in order to buy their own home. One day, a quiet, middle-aged man, Sawaki, moves in next door to them. Being separated from his wife, Sawaki feels lonely, and the young and beautiful Ayumi is dazzling. Sawaki, who has developed a desire for Ayumi, climbs over the balcony and peeks at her defenseless appearance, making it a daily routine. However, when he can no longer restrain himself, he cleverly lies to the good-natured Ayumi and invites her into his house...